Following the transfer of ownership from Metronet to London Underground of the Sub Surface Railway Upgrade Programme and the associated cancellation of the signalling contract, there was a critical need for a specification with which the stakeholders could approach the supply chain for a signalling and service control system.

This would support the operation of the new (S7 and S8) rolling stock and deliver targeted improvements in the performance of the Sub Surface Railway. The deliverable would form the basis of an ITT on which suppliers were asked to bid in a procurement, valued initially at £650m.

The existing requirements set largely consisted of detailed design requirements which could not be assessed for completeness and overly constrained potential solutions. Effectively the requirements set reflected an intention to design the solution rather than a solution independent specification of the functionality and performance required. The people involved in developing the requirements set had also become used to working in the solution space. In addition, whilst processes existed for requirements formatting, they were insufficient in terms of developing a structured complete requirements set.

SEMP resources were engaged to manage the requirements and V&V team and provide systems and requirements engineers within the team, working with LU staff. 

The team argued that the business needed to first consider how it wanted to operate and maintain the railway, then specify the functional and non functional requirements for a system to achieve this. This was accepted by London Underground and the team worked collaboratively with operators, planners and engineers to build relationships and to achieve buy-in to Systems Engineering processes and techniques that were proposed.

A plan to deliver a fully endorsed Signalling and Service Control System Requirement Specification in 6 months was proposed.

An early output was a Concept of Operations that described how the future railway would be controlled and managed from a single new Service Control Centre, and by a radically different control organisation.

A process for the elicitation, drafting and management of system requirements was established and implemented to create a high quality Service Control System specification which included a rich set of requirements for all aspects of automated service delivery, train control, passenger care, operational safety, availability and performance.

SEMP resources also proposed and delivered the engineering management section of the ITT which included the engineering lifecycle, Contract Data Requirements List and Data Item Descriptions for each engineering deliverable.

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